Mathematics, 28.05.2020 02:08 jeffylovesgreenbeans
The director of an alumni association wants to determine whether there is any type of relationship between the amount of an alumni's contribution (in dollars) and the number of years the alumnus has been out of school. Based on the data below, compute the value of the correlation coefficient between the number of years and the amount of the contribution. Years x 1 3 4 10 9 7 Contribution y 630 180 210 30 90 90
Answers: 3
![r=\frac{6(3750)-(34)(1230)}{\sqrt{[6(256) -(34)^2][6(490500) -(1230)^2]}}=-0.8287](/tpl/images/0668/1560/1980b.png)
![r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}](/tpl/images/0668/1560/ec454.png)
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